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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021102dd89f2569c006d455834a06f7b7d8e29d1b861dcd1549ced148be4765a' 
  AND token = 'QBhcItngBnCokrHmZsDabrIm9ZZGzYLlzyBBEXRR/84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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