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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a049dd353a1103e2e1a2f124dff8044015248b548b028d06385b5945ebbf21ee' 
  AND token = '9MLAp1D5jh6hmEAe+7KXi0bGw49ebxDT4JnOSvJtv1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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