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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3906198d99c49f5f8a14b2a6e38bce5394d800938246d661eb2c7e719434ceb4' 
  AND token = 'vwY4ROKeaSJF4mareAv7yHTVJpd6D7HZt3q/mwCP2zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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