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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce159669debbe0d988fa69ca1e7d2b5e4105ea5f031121d8df3238044d35da80' 
  AND token = '2qSDvlVHSn57ybv0xwJgn3pPGSOFclmqaITXlMC9JJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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