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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1d98ecbc9dddc4ffd8b0138fdf734be715c344d60bc813b181561a6b69246a' 
  AND token = 'W8WkppIodAPfeUo71xh7mz6qp455RS8NcI21y1N8hPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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