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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c3a98bc19391c3d44f3ab883e519374f0caa62f8fb43e8e9f298b39a98af1b' 
  AND token = 'WnwoNErVSAHwDRVDrL14JnDggWocfORKKWK0YSjoE78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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