SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000ff94694184dd4c9295d24a5527c111c46a2c39bdb9a36b96fa06c7d348ddb' 
  AND token = 'qL0hGgLfOXSUcvy3AWBXMjMo8eAt7l7rk8+Kq0YTQ/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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