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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc1057f9b011dc9a2c1638cb9253e33f1c4fa1e0b59b00b099c2dcdcf62d883' 
  AND token = 'KNvvNyTBBtmHQuWe9W0RpoMLMQ30HJlkP1Ger+gobmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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