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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e73c49757391b3e75b136e36c345ac318aa81bf840562a76784abc50cc7742' 
  AND token = 'SuKgCupBHnqxuLjxg3uYTDJ0wthMXK4t0tEb87KnFmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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