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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fe717d5e077b459a6d6ca117a6525b56e331fd4a955f9ef009d7edc87a46cf' 
  AND token = 'i7RPA2noJzavljVyG3gMlmWHT1G0rxOtG+TI6onOd0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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