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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1daecfe426c023a0ca249d784082867363e8c8c171eb9f8d4c0f62324e9ad23a' 
  AND token = 'yREUxr+37/DJk0QQH4ezqjAQaVKgpP8Se2JTzgExx1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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