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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b9ed9eefd1fdd85c2e8893bdb82d6d2ef9fd7ae0cef5ba61511a7aa9839756' 
  AND token = 'hLN8LtGh2CAi/ebwseLUDQNQRxSN5ej3wbSrUXxocD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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