Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156259aed367f04020af8921f2c2b71063f5bf8d4cbbeda176cbdc6ec096324f' 
  AND token = 'mXLl7JjVvXtz2503cX7k3GiFlH+cSQksACVJpnuOIVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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