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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd57accbf7af08572c79a134971ab8dfaffbad7753498d16df82e3bb64eb2350' 
  AND token = 'ubRY9OD5W0+y2eO931cvjts2OOnxv53Z2VQsnYIIh0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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