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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25904ff32e8d2c2a25243fe6420cae1777c69863e367b249801b40e4ace0e2f9' 
  AND token = '8c17hrUi2c5xGMiScoJ32LXy3KJu3M2tP+PhBAsPPWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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