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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9be4bef2c6b59bd6913b7bb2584c6148be01de8d814c7b6ada05bc6abc8e663' 
  AND token = '0q/pNnhmEh4Bl9GDbPxbeQWiyt2zha99vb1eaPeRLf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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