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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fff8f99a955fd8075c0bd5701e6f8da833bd2e47a9e6c191d01b38e1a09a02' 
  AND token = 'FvpESthZIIoT/PlR9wpwdLbF+Wxf9Qfhx7iyQ3K+jvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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