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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b67fcca20643baa481269c4ac470b95413be15bc19e52435e8e017dfc8fde3' 
  AND token = '6RLKJnpCwp8rVoIvY9gwtRFAfEkerG3om7HYO2YXrrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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