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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87948b1ad45aabcde1f00fdac63b865a9ae82db5b5c67d9f8bdf161aba75f4b' 
  AND token = 'YVPjrUCJhp0GKU9rV63MeUObx5MTYF9qOoxkWN2vH1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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