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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57796ab2554d5460a12b128027150878d1a5b4ce808120b117116887f1889ac' 
  AND token = 'ASgeOFvOmzlYg8skcrkv2GHlakWFcZTA9EQf48Bfg7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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