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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832182ef753339af59a7f022b2da2bf270c3a84e56f434c4eab8b53b871f66eb' 
  AND token = 'xi/4w3yQoMeHpMPDqtayOa1U0XeG9d51VK/0utUWV/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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