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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a24803935b9e0f925a5a89ab421b1d49566bc9432a91b7910c8ed5e4479c93b' 
  AND token = 'lw0veUJgYjeEj9KfyEN34gJjXOuq+E4iODODpy+gmKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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