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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a39a589a17d89822d92ec2fc08357969332f97e4395608322c11f52ef20e92' 
  AND token = 'H1LZ6Zdbj0U/7rBl6RwhHFMhTm/jUaIUJLfmlyMCmCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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