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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890fcdc10a6f4a7e9764e3f5927e72e9ac047cc922b52fd36af9b5080e602b72' 
  AND token = 'PV43+SdX6olrauHACO03pvbWdgljOEgLZpx+HKuS5gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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