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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428d44ea294fb8ecf94f7ec1133d766719397fb35d507ffbd458be3bf3d1d0a4' 
  AND token = '7dZk5M5SBCtw3JGil62P6o0a+xFlSL3lQzOybWxUTsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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