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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340f44175134f428dfeadfb40ad160bbd2ea3504582ba2e5b37c46267c18d899' 
  AND token = 'hTFSXPnDdbnV2O2/e3FrZmWrpUbv7REOoiGjdxXgSmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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