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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd27ed2a1ea68fd495bc7bf78f5fa83b2472cc2d8d6fb32d74abb8dc8fce8610' 
  AND token = '7KKgUSoN1b7Z7UDJapf8IkcFZ7No9TiKLUmgf9/KVEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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