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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7a4ee97c9a9e1b5bf4f48d30008b78a386f95effe11a748b97fc06f89c299d' 
  AND token = 'cWBtubI7C8esIBVKtlv5ATRencmZXwhqAP07lyLkFBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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