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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '729acc1d95418ebde93c91bc5c117b41c2e86a356c35f70d5d542d3e3c57a995' 
  AND token = 'RzRWbWsAAVQ662K8Mb0nSxwuEysPJoJKfTtpoFWDBbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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