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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f91df348a340506c506b9943f2b16190a64264f02eaa49f0f62a7fef29c64d' 
  AND token = 'TgBk3LrV98o/k8/rgP9kkUHuXIW0f57Eh4qZJ4RnLm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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