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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63487a6f01933f005a66d00053c5f44e4b1842b876179fcef1a188fb7285c349' 
  AND token = '4yoIkIbbmlLGVRRq/JZc8t0nbp9HCFQF76mlUGi3KkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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