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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6905ef4cf8060ddec2188474853a5152e2973f8a48f967289cce0300fcd6c770' 
  AND token = 'YFTE6EDZfqHVYHKH63DZlWy3BKaJscaG2Xd8Krz9ljI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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