SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605d865361ce2848259abb05cdda1e38961724707c72cebe37f01443a647855f' 
  AND token = 'BxgL4Z1thsGrXj+eBEul6GKEaAxLVUbGrqlFCEVDP/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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