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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc3af24141da806274eafeb6a2824dcfc0f7f7acad841209f9bec38de21252e' 
  AND token = 'f7WXGM17tK0T71+Sy/CmG3AP0RGgOswbmpGbYFaw0v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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