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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409c34040b377ba2296d2c022bff4fc346cdf0c46bd19703a0dcb7f7631719f3' 
  AND token = '4sRZSCMj3dV3CWygO2wwS9P6CfaR03b+Pjj+BDlBi04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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