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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb5a45e050acfc6344aa1429e1992aa6036ccb5700e8a19ae9d68a294e906f1' 
  AND token = '30UaDQ+VjUsyIT8f0pp3MA2uNC3AzORqNvEiVpC57wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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