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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08670292922d5becc1dbe81da0e9b6c87757ba269b07a9b33e52dcda474f60eb' 
  AND token = 'DiTJCuQWq6nqrq5C9/ZAHUnYOSyfapE8ZvgvqNCu2Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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