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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924f8ffd2efceb098320823501603cf3c84dcaafbe3b24e4e86fb8885cbb5f24' 
  AND token = '9UIIKgNF6tYXjDvyG1+gao7IWUUYDV1JhIhvlFgvjF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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