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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2417352820b69dc35659e6e3de646bb5f65926e54907b98f808bec8d6136d8' 
  AND token = 'COXQdH/arufuDooFW/02w8ZxhuD1lhrgTENExWGti6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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