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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368034a909912a743e4b7b1caa4da00d249ef19fc66703c2c857c75e1e469164' 
  AND token = 'wPpIkemNrzn0l/P0NNe+3uWquplcE9jBr7Q6goLkYzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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