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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9bb8cf1da93a50c4a89cabdaf30cd72f8ff351105245e5b76ec5290bbb1d57' 
  AND token = 'Z/S0pEBoJKh3+s0OZh5r5liFieqR+41YhgOTiLyEiWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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