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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e96c5824c6f83a30e132101f2cc31122b1317888efb167389a6ba32a61c5e7' 
  AND token = 'pAUGZOpFU5v8VFLR8mvxLRt/mgy9wV6jGUUoQ5cWlFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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