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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87afc05f5abbab25c7565a228b456ccd9e8f082a46c65435e0686840d0364ca' 
  AND token = 'gWRlU8+rXnII/k4DIcOej5igeb3jtsI3zJvpGkWR/F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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