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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f163be6cc49ff82534ed51556a8d68e76768c7b0df6007f19da3d5a7477f46e4' 
  AND token = 'tWEZCxoZc7GfoullGT/qSHvk823foDCxoyhuUF3446g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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