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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fe43e5dd8e16257e2b4291c826e4cc290083586dafcc23b222e7e9c8045136' 
  AND token = 'TiOisp3u3elsKZCyf3Ct68S//wEjfZn1uLjgcwaTK0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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