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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f177047a2b259ac1e206ab9eb7d107f624c12b94ec7a3ff270ca70145a6a97bd' 
  AND token = 'tBaHOawrpVCc52ChHMw/nVxWs5NpHmupfqa7YQBKouc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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