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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591177478d3a0a1d58f7eca9d1a4e27b12061f3818c7de0024bc5c5a81b1e6f4' 
  AND token = 'Xhvv098J3nCk7dOwjGy8T8Kq9aMo/d4LoMw+0a9HYhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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