SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69552d8f9bbb7667140c940c8f5f4a2d124aa3f934756fb534b58d8be5dc5dae' 
  AND token = 'gWAlI3eLVdZpq3/BhIJjjUQSCG+PI6wwXhO3aayRS1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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