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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05211f3d98f814f7c7e3090ac056bd60558f02a192e9d20ad9e84b5844ba47b' 
  AND token = 'Hfz4VKmu4srbCsAK9NR0MdYveqmwsszqBuq7PO3JIsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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