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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b4a6906ece03cc63ee440301eb04fe934614379f7151f2f7bf951124a01e8b' 
  AND token = 'QXQ9nTuh7l6lSHUtuWu9kzO1u2u5DRVfVRxQMoIXOsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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