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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdca6698484a673d5639e0901c4a43a1b017290564cefcf18b52f6b559df0574' 
  AND token = 'Xd3uONzOdQZYRuW+cIbu12DYhIQTP98J15wNjYqaf9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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