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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5c7b4aa544da755a0e2d4b408e1413585ad766387fd1ed4be7197c4f309bb0' 
  AND token = 'TmLu5o0R4FL0AlzHIDjuHa4yBZZSaXJFD+BCkQZRmzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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