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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f007ea12d747640d6622ce4c122acacac65b39c65f37bb3572e6d923ac80ac' 
  AND token = 'gu9OkuhsmfwMmgoRCXlKCTeyGP7RIdvUZOODWgWPl3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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