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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3978025b4672563e3c438f10733e580c4dd674c68b595ea9efda27600ed9bba6' 
  AND token = '79aJJT+1983QqfWKSLvXWe3J1NOHvhtwdXODzc7mtwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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