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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b355899bbc9c92c445850720ca7dbf21dcf2bc330aa746b7fbb0015a038597' 
  AND token = 'cGcm6C5iDn0Iig3J3eEDDULevFk5REdabVK4K7/Ih9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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