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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ae900935abf4622545af4964ffef5f8e7934eefb40e9b717685a7f68b6a05c' 
  AND token = 'K0FSc8If3WCRha/a25cLRgnOl6vSaBy8msSuZy32xdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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