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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a195886b4ef3e62888938630dc59d339bf47019df3b139e87e95e976cb91ac5' 
  AND token = 'wrFijNwOVt4/jMikZxOy+h8ZBN6FpWvx5ohS5wjZVng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}