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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd54fab1844bd970bd7d4a4c16dec7f1bc4e269a89e87e2064dfd95cf16ddb1b' 
  AND token = '3Z8YDsehisHR8ERXMrvTvF/51yi0j70EDoEK78eAF1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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