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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765a1a5a93a71e843b74279aa241b8c4c224fb0f04c1432156a2aa04558ae1c2' 
  AND token = 'ftKeix3mcXiA+R8HoYfGg4CBW/SyTtnI66xJV9RtDFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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