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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6030356f4c62e3ea6b3af4eb0e17117273a07467fb85173c55d52e9ebda599b5' 
  AND token = '9a/fyN07ZvwJV4ymdEZ/yjVwKkwmT7r1M7Zw+hlH39Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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