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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d76c646874a5a1a4612d20263b55ab1b3253cb14e3d76d7ff00a32513d57ce' 
  AND token = '+92NwOUce8nwi2H22I16hGZlW/Co0YOVScl4fdlSRjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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