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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1fc66e70e5a7818a37f5392ddf8c9af4aed8197b9e1c3eb37a45abb3aecf85' 
  AND token = '+/rZF8Zn7Zy5s8XX4J9I9OnXCe+V+JOexdNRTyWi78E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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