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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd134ef5249226d065193cdd03c17bc5ebfee69e8f010671475db35dea3612933' 
  AND token = 'cxEknc8RSpXs82SNOs+VRMNMIwClNdYrT8LXJEUbFlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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