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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43911d830feb15f9f8f88170ec2b48a42dc847dde271ea8115c3c5940aa45799' 
  AND token = '9VdWQ9xQ5nZtsIDS748l9geaG3VvBa1qwL8wyukx5QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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