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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f44d23116603d6a027c5447b7422e5c4f6af3a2d2150715a20e077eb385bc4' 
  AND token = 'e6HYh7AN47F6Spe3hH/MdCY5WwKZMkEAmHns2PhCU2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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