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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642c39f613bc0fb0b80c7459ad0712ce29ef975b28fdce2ae526901e089c4fb6' 
  AND token = 'RX3j8XauVa0okKX5hw7Ge1WTPul01Ee2d68L5zFeMqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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