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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59dd09e2807ad0f534a9e3d2c240940e9347b6602d9feb7ce1f4a91dce516ac4' 
  AND token = '9LudctVdOkHmnkbHCn35sK9dGWFoW0+s8tXns/ms2c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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