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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674a331b27470ba94e90f943beb6381eeda4ba916a30c47ee8e03fb972f2af40' 
  AND token = 'XxIr+3Fu9dxarjolrGuAo7FyGrdYNdzJhsWGhllhKPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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