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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3153adf2883011de0f2eae0eb5c6eb9dbd64f7e851c41d1f5e46b0e1b71b37' 
  AND token = 'TDibhRbTfYnW/t7eYJtC/CxBgUzNXKALR+bIozyfMyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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