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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7bedeb602cc62c1ecd7d32e10aa023c36eba63d68e366f72ab24feb28ab48b' 
  AND token = '/Yse0qwPR1B1oYqc2WjXUlY8E7GARUbmT1WkSOeoOWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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