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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a769e7cdf30bf8351ee92a9cbf63a9e43aabc684293af1d52cdc77b2586b73fb' 
  AND token = 'S8ErB69pAiAT/52NzkFX6iuYpGgpKXUMmK55fpllbLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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