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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d18c36aa27d7ba1dcf7d8327b8fce80914a7d76323e35676b48683af3f8e7dc' 
  AND token = 'zZkLw/b8/9Yx4gWfzfNe/deLFvPC8KBRVysF0R/QswU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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