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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1befbd5f07a2f3f8bbf3f7ad12ab76d5860fb641ce47ec1462ffb8a69ca445aa' 
  AND token = 'M9RsGuYOVrwh3Vbg95kCfFkyIw9uIyOMFtYevoeQ8/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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