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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5e8b96d319584922ec30c2bfff821e464626a83acae41fbfc6b8e4e7da6fc2' 
  AND token = 'qf4ICHmS9DMHwZ72yWTzqAo9UWru86Y+hly+74EnQeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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