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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf5ee0e2ddfc3aef69a5dabb21c3ab7a2307cd7988bd224c5e9ceb173c9e71b' 
  AND token = '40yJSg0WKPSRg//8sj6lgqVqVt5U2KzuNv873LPeLLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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