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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06de37f3cc461df888abb42334688ea57e85ede8f7b5e9c4bfa4f65acbb35c92' 
  AND token = 'MZ9YZPT76b25spyXOS+RI8CUGHc5o2rzAPlMItj2gVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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