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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93bc7f80f36616d1f35e000c16c3ff8637a7aaa2942cc5bd035345a6a209a50' 
  AND token = 'ka+u8UaEUfxnbgTYc6hb6eWAILumdJovFUzCBghpbKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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