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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ae5dead30617c3a30a35014ec99d1b0dda826d5bd3b46aedfd7125b91881ee' 
  AND token = 'kz58yUkDnWFjY/wjzB7csTayjqKte4d3YE5/NXZcUo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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