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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739bcc596b2c7354ac634ddd918ab9cbc2bae54619210438b0f358a36fc23ccd' 
  AND token = 'V/0vgm9Q7zQ9CFRY7j621zMm1vZwy0I8LqfrZ60zrq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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