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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab08e88a83c0ea2be7dfc14185c1df215aaed8799e52251c41f031b6cef0fb2e' 
  AND token = 'oZB5nMvjfTldGPhUpB+0FO8EKGZBpX8z24kt0BPMycg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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