SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e290efdc7c5e32e8ff234f7cd5d3bb0d09ba48b6016076177f9a679a72b08ad5' 
  AND token = 'MG6QdwX+AfjZZ5/e8s/lH/nXzOX+ny0BkaOVJKSG/m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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