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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f5f93723fd41f2d7dafa7eaf2dc1ff8d989331d2b3bf8f1c841aea550e6440' 
  AND token = 'pbsbf1d4xdnVZTcUGevDE9OrHVHZWDqahq/xqipQxxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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