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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9633d67dd7862c0613322830c2ffc9f928ea1c4741dcf3e72059c8cbd8c8835' 
  AND token = 'XtC4M4tB774Lox8l01orQWTnyNIH6cdse9dJHsZ+A80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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