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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c89f249de484fe6a3c329d0f4596c9ef2340de48adb9ee338cd5a7098d7a97' 
  AND token = 'N525zQQ14oYILMwojKOsJKsZwj04v/DDDq/yv+sRteY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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