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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff97eb01a0a9188726c008e6d3e9e68751355eab7367160365e5a61b10abe3de' 
  AND token = 'pYsAzvMzOfh0PvDolq/e4lRVFxrf+xXj2DIwxRIZiGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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