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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423d4d37a57377d0a0138c42762b9737fcac5ba7352c566c1748b18f332193f3' 
  AND token = 'UERl/lPhT7yZlOhH/GvlFgXkzc8oyy5vV4D8+Z3rHcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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