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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1520a790cb7e989eed62d7d60c19da8ee1ad8f98fefbd4952096a869af3d5b' 
  AND token = '81nXBHZLCS3FA9e3bZMTRtKVTUC3ldRPWi9g1Rv16XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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