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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19091281703b31134ea69f71bcfd77936d21759e6ade6d660c0fabdfa255c24e' 
  AND token = 'Um+ROQEEKCnad5uuzP/DBDCz/h4daHck9f/zMiyFwSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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