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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff30aa47dc2f28203a4a7a6e6854471d592198baca8a8210008e29b217763c6c' 
  AND token = 'LqTrMvoDCgQvwuNISrxj3bDUVcCHfAQh2WtSb5R5ORk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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