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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cdb04766bab4ae7c693c06f26400cbbb3fdb97681cf1e927fa10bfe95491e5' 
  AND token = '2tKmLxXRW4yJj93W9Ysz0FRkxVWSR3zFa3w1e7VkbqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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