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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd683ad631812734e3fd97d3491477488e834a3b17d75091be0444a484739ca5e' 
  AND token = '22SOsGBAA8O+D6s3LULTxIK/BVHqHE02KdpwQlVyeyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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