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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615a42b4fdf2ec059afff24616176d545e034a15b4448fbf19d3eea5d191dee2' 
  AND token = 'dVh0biWoOhDJK1zjSfxumwySbXvhukO/Wjr6vQiUuSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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