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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417eae37bd7e97e23cb57edcc7bf610efbbcd77bc8550db3e867439b3e34fe99' 
  AND token = 'huVV8j6CzRA7Y1ATa6iN5F/mbIpzfNvCrXupefg5pZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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