Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a899f14bddf9340e7cee8d0425fd3d691e4f5d204c77c3dbd68759e9b67fd11e' 
  AND token = '+q6bS4uyvXNAi3+YFtFZRkjmFyrHfPgaBb9mRZqb8LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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