SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b557cefa851b944257e052894afabbb108fd7b7d3a309082694450b92ed78e' 
  AND token = '1apwxZhOaIh3dcgqQ+7LEEFqV/UJGz3n7PqrGhUW0VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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