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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59e6335ad4fbad4fa48e9daecdc1cbb5d53dea63e7af734fb15f42fe19387c6' 
  AND token = 'dUkWNUvw4/0q6AtoI7VVuWTZjRHWK6TY6swx9KC5zqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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