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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4a4c8304fde2f15f8dbece76adf924c12afb679cc5d34c5d6485ec99633780' 
  AND token = 'NuS9g6DbQ38KevC0qmtWXoNM/MmY0cplrq3BGknvzo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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