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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c5a2ab2e8a2c8f60d5f48a79bd131c77c936698e444e5461ea43ce4babb286' 
  AND token = 'Hbgsrxli3qwjkX+ZJ08SY2FFx7m5wCf8Sl9MUwEvrwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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