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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b779822607aebc61024c9a0d19684cbdc888a0c2b67a0b6ae846f395a75091' 
  AND token = 'Z3xGcCRJlwMLcwEgq6XxydOri54CwcMKKO1lAJ9idvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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