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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756a254896e75a4caebfdba01095b6bc1269420c3284491855377a3954bd2b2e' 
  AND token = 'BmhHEtRbRu3ZE90+dXdn8XGL542q/6DoJ4qcsFbZmhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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