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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb79061da0f7851d562c9f6e57a9a3e3cfe7e602d43fbcd94227f9652dcd6b8' 
  AND token = 'hzTQURMObIpIj8j0eyjPr0vNj6HhBCWOvS/QXu+3ao0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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