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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5f0e62e6d93627fa3a80896cfbf23985539a72a4cac4f89f78ea1c08f0079a' 
  AND token = 'IYAU/X6nkPT+GLqKEIFfNtMxHxl9sdqA7lvSGgL39Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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