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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd038e45dd46b41a818dc8a268d987a5a7e6534ae3b8db5d0276a2a78bd6f7f9d' 
  AND token = 'BBLuhwA0wxwyjOSa8FzqC7LbDbrcU3M1WoQ21HsWVlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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