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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bde8fa0d17e5de789dc40eabc4bf522306013f4b8242c2a608e234f982746b' 
  AND token = 'Mh/5yu3octp23/M6qJhOhGZaNncydrkeB91kBDwL+n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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