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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd41f6c5396e8b5afb6e294354c2428a09e72577ae838f7de4c22e8010f849e' 
  AND token = 'HAaqtBYgxqu9LK/506gPl2ESzzRm9yoaLYW9pn5poXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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