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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad1e28567e0a7bea388aa1454d415fbd4b6522ccae7fa0bab7caa0bb2ebee01' 
  AND token = 'BUY083zXUSunRPoC3glwxwcj8tyS8ljKwswb5AWu4DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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