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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66128dd203ef9db841e6164977b92bfa5eb6151b8805c8fb87bc59320aba73d1' 
  AND token = 'zlF652fu97D8lztBIGKD0RtQ12h4WJD6dSlJ2f1bIxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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