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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b704e6d4119962e21afcf13aa1546356913720c4031b247453db65b9fb80d5' 
  AND token = 'AjpiLcN80y+o6AX5bVNzkZoHHppx+W/YrCa7bjj7WY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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