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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea3e96ff623f40a7e1a23c84914cd60b820c75e252b65859340426705f494cb' 
  AND token = '2GBb0kxHny2kJrZmQLh1v3dBny4s1SOYYVJlGSBDk1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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